that seems to be the simpilest answer i can come up with in my mind, but I wonder about the legalaties of this course of action. Also because of the size of the person and the small area it would have taken multiple shots to get this person down before he could charge me and take the gun away.

I also didnt see why every man in there just didnt jump on the guy at the same time. Strength in numbers.
instead, no one did anything. What would they have done if they guy would have died and they stood there and did nothing.